Stud type track rollers KRE..-SK, single row needle roller bearings with particularly thick-walled outer ring, needle roller and cage assembly and a solid roller stud with fixing thread and a mounting aid, axial guidance of outer ring is provided by the contact flange and contact washer, gap seals on both sides, with eccentric collar, assembling aid hexagonal socket only on the flange side end face, no relubrication facility